Oil bath insulator



Jan. 23, 1934. R. wElLl.

OIL BATH INSULATOR Filed Jan. 27, 1931 (qm/'megs Patented Jan. 23, 1934 UNITED STATES OIL BATH INSULATOR Robert Weill, Paris, France Application January 27, 1931, Serial No. 511,573,

and in Germany January 27, 1930 1 claim..

The protection, of insulators of electric lines along the coast from salt spray is effected as is well known by the use of oil baths, the surface of the oil permitting of providing a satisfactory leakage line. v

There have been used for this purpose insulators with pett'icoats curved inwards so as to forni internal receptacles or basins. An increase in the leakage line in this case would be obtained by a reduction in the internal diameter of the basin, but steps in this direction would quickly come to an end, since 4the basin would come too close to the axis of the insulator. Moreover, it is not always possible to make the internal receptacles of suiiicient number or of suitable dimensions in insulators having multiple petticoas having regard to the small space between such petticoats.

The insulator forming the subject of this in vention permits of forming oil baths in the insu lators having multiple petticoats and of doubling the leakage line obtained by the type of insulator in question. It is characterized in this that the petticoats are curved inwards in such manner as to constitute external receptacles protected by caps against the weather, these receptacles being capable of being combined with internal receptacles.

The accompanying drawing illustrates half in elevation and half in section a construction in accordance with the invention. The insulator .support shown comprises three petticoats a, b, c of generally known arrangement. The upper petticoat a is curved inwards towards the upper end so as to constitute an external receptacle d protected by the cap e' xed to a petticoat of the element above that shown.

This receptacle may be of. metal which would simplify the construction without reducing enormously its function as an insulator. It is known in fact that only the oil ensures protection against surface discharges because the insulating surfaces not covered with oil are rendered conductive by the salt deposits.

Such an arrangement is obtained by the re ceptacle fitting the petticoat b. This receptacle i is combined with an internal receptacle grand constitutes a channel fitting astride the cover. The total leakage line to the surface of the oil is thus double that of the internal receptacle. It will be seen, mcreover, that the radial dimensions of the latter cannot be increased because' of its .proximity to the supporting ferrule h. The receptacles f, y are proteced against deposits from the atmosphere by the cap i. 'To their common base is fixed a cap :i intended to protect the receptacle of the Aupper peticoat of the following insulator which is not shown in the drawing.

The arrangement described has the advantage of being applicable to any known type of petticoat insulator, of increasing the eiliciency ofthe oil 

